There is quite a bit of info available on this subject. check over at 911 and UBCD4win forums...
Anything is possible... However if you thought the explanation you already got was very technical and dificult to follow then i guarantee you are going to pull your hair out when to try and get your sound to work, especialy if it is a HDA device.
Yes i am sure sound is not supported, but with enough time and effort you can make anything work. It is beyond my ability to help you, again check with 911 or ubcd4win forums
Why use vice grips instead of a socket to remove a bolt?
You want to watch video and play games Boot into the OS. That is what it's for.
You want to back up a partition or remove a virus use BartPE.
useing Bartpe to watch video and play games is like using vice grips to remove a bolt, It's just not the right tool for the job... and you will certainly not get the acceleration you get with an OS (poor frame rates and choppy audio at best)
What are you trying to do, please tell us and let's see if there is a better way.